package com.dxd.roundimageview;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.PorterDuff.Mode;

import android.graphics.PorterDuffXfermode;

import android.graphics.Rect;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.NinePatchDrawable;

import android.util.AttributeSet;

import android.util.Log;

import android.widget.ImageView; 

import com.alan.myimageview.R; 

/**

 * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。

 * 设置颜色在xml布局文件中由自定义属性配置参数指定

 */

public class RoundImageView extends ImageView {

    private int mBorderThickness = ;

    private Context mContext;

    private int defaultColor = 0xFFFFFFFF;

    // 如果只有其中一个有值，则只画一个圆形边框

    private int mBorderOutsideColor = ;

    private int mBorderInsideColor = ;

    // 控件默认长、宽

    private int defaultWidth = ;

    private int defaultHeight = ; 

    public RoundImageView(Context context) {

        super(context);

        mContext = context;

    } 

    public RoundImageView(Context context, AttributeSet attrs) {

        super(context, attrs);

        mContext = context;

        setCustomAttributes(attrs);

    } 

    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        mContext = context;

        setCustomAttributes(attrs);

    } 

    private void setCustomAttributes(AttributeSet attrs) {

        TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.roundedimageview);

        mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, );

        mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color,defaultColor);

        mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);

    } 

    @Override

    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable() ;

        if (drawable == null) {

            return;

        }

        if (getWidth() ==  || getHeight() == ) {

            return;

        }

        this.measure(, );

        if (drawable.getClass() == NinePatchDrawable.class)

            return;

        Bitmap b = ((BitmapDrawable) drawable).getBitmap();

        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

        if (defaultWidth == ) {

            defaultWidth = getWidth();

        }

        if (defaultHeight == ) {

            defaultHeight = getHeight();

        }

        int radius = ;

        if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框

            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) /  -  * mBorderThickness;

            // 画内圆

            drawCircleBorder(canvas, radius + mBorderThickness / ,mBorderInsideColor);

            // 画外圆

            drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / , mBorderOutsideColor);

        } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框

            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) /  - mBorderThickness;

            drawCircleBorder(canvas, radius + mBorderThickness / , mBorderInsideColor);

        } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框

            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) /  - mBorderThickness;

            drawCircleBorder(canvas, radius + mBorderThickness / , mBorderOutsideColor);

        } else {// 没有边框

            radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / ;

        }

        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);

        canvas.drawBitmap(roundBitmap, defaultWidth /  - radius, defaultHeight /  - radius, null);

    } 

    /**

     * 获取裁剪后的圆形图片

     * @param radius半径

     */

    public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {

        Bitmap scaledSrcBmp;

        int diameter = radius * ;

        // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片

        int bmpWidth = bmp.getWidth();

        int bmpHeight = bmp.getHeight();

        int squareWidth = , squareHeight = ;

        int x = , y = ;

        Bitmap squareBitmap;

        if (bmpHeight > bmpWidth) {// 高大于宽

            squareWidth = squareHeight = bmpWidth;

            x = ;

            y = (bmpHeight - bmpWidth) / ;

            // 截取正方形图片

            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);

        } else if (bmpHeight < bmpWidth) {// 宽大于高

            squareWidth = squareHeight = bmpHeight;

            x = (bmpWidth - bmpHeight) / ;

            y = ;

            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);

        } else {

            squareBitmap = bmp;

        }

        if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {

            scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,diameter, true);

        } else {

            scaledSrcBmp = squareBitmap;

        }

        Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),

                scaledSrcBmp.getHeight(),

                Config.ARGB_8888);

        Canvas canvas = new Canvas(output); 

        Paint paint = new Paint();

        Rect rect = new Rect(, , scaledSrcBmp.getWidth(),scaledSrcBmp.getHeight()); 

        paint.setAntiAlias(true);

        paint.setFilterBitmap(true);

        paint.setDither(true);

        canvas.drawARGB(, , , );

        canvas.drawCircle(scaledSrcBmp.getWidth() / ,

                scaledSrcBmp.getHeight() / ,

                scaledSrcBmp.getWidth() / ,

                paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);

        bmp = null;

        squareBitmap = null;

        scaledSrcBmp = null;

        return output;

    } 

    /**

     * 边缘画圆

     */

    private void drawCircleBorder(Canvas canvas, int radius, int color) {

        Paint paint = new Paint();

        /* 去锯齿 */

        paint.setAntiAlias(true);

        paint.setFilterBitmap(true);

        paint.setDither(true);

        paint.setColor(color);

        /* 设置paint的　style　为STROKE：空心 */

        paint.setStyle(Paint.Style.STROKE);

        /* 设置paint的外框宽度 */

        paint.setStrokeWidth(mBorderThickness);

        canvas.drawCircle(defaultWidth / , defaultHeight / , radius, paint);

    }

}

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="roundedimageview">

        <attr name="border_thickness" format="dimension" />

        <attr name="border_inside_color" format="color" />

        <attr name="border_outside_color" format="color"></attr>

    </declare-styleable>

</resources>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="horizontal"

    > 

    <!-- 没有指定圆形ImageView属性时，默认没有外边圆颜色 -->

    <!-- 需要将图片资源自定为src ，或在程序中setImageResource(res) 不能设置background为图片，这样不能达到圆形效果-->

    <com.dxd.roundimageview.RoundImageView

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:src="@drawable/img"

        />

    <!-- border_outside_color 外部圆圈的颜色 -->

    <!-- border_inside_color 内部部圆圈的颜色 -->

    <!-- border_thickness 外圆和内圆的宽度 -->

    <com.dxd.roundimageview.RoundImageView

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:src="@drawable/img"

        imagecontrol:border_inside_color="#bc0978"

        imagecontrol:border_outside_color="#ba3456"

        imagecontrol:border_thickness="1dp"

        />

</LinearLayout>